Samsung RL-28FBSI, Service Manual

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10
7-4.Temperature Control
Operating principle
Inspection method
A temperature control is used on all refrigerators and
freezers to regulate the operation of compressor and
thus maintain desired food temperatures.
The temperature control consists primarily of a
capillary and billows assembly , a set of normally
closed contacts, and a mechanical linkage.
Pressure within the gas- charged capillary tube and
billows assembly responds to temperature sensed
at the sensing bulb.
Rising temperature causes the pressure to increase
and expand the accordion-type billows.
The expanded billows actuates the linkage which
allows contracts to close.
When the temperature drops , the billows contacts
due to a decrease in pressure and the snap-action
of the linkage opens the contacts. Put the probe of the ohmmetor to the terminal
of the temperature control, and check for the
opening and closing of the contacts by turning
the knob ON and OFF.